I had been toying with the idea of a Left4Dead themed game. Same basic story but no "special" infected, just plain old running zombies.
1- survivor players will only start off with their secondary pistols, maxed out. Their primaries will be taken by the host and hidden randomly through out the play area.
2- zombies require 3 consecutive hits for death. Other wise, they can retreat and stay put for 10 seconds to heal back up to take another 3 hits.
3- survivors must stay alive for 5mins till rescue arrives.
I have more details if anyone would be interested in this idea. I was thinking this scenario up with CQB Toronto in mind.
"Hey I'm the first one to say its a great country but its a straaaaange culture. This is a place where gun store owners are given a list of stolen credit cards but not a list of CRIMINALS and MANIACS. And now they're thinking of banning toy guns...AND THEY'RE GONNA KEEP THE F**KING REAL ONES!"
-George Carlin 1937 - 2008 (RIP buddy)